Measuring apparatus for measuring the concentration of gases uti

Details Measuring apparatus for measuring the concentration of gases uti Measuring apparatus for measuring the concentration of gases uti

1996-06-03

1997-12-09

Hannaher, Constantine

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

G01J 2161

Patent

active

056963793

ABSTRACT:
A measuring apparatus for measuring the concentration of a gas by infrared absorption includes a first radiation source 11 having a first modulation frequency, an arcuate waveguide 13 for receiving the gas to be measured therein, and two radiation detectors (15, 16). The measuring apparatus of the invention is a compact gas measuring apparatus having a simple configuration. The temperature dependent and deterioration dependent changes of the two radiation detectors (15, 16) are compensated. A second radiation source 12 having a second modulation frequency is mounted between the first radiation source 11 and the radiation detectors (15, 16).

REFERENCES:
patent: 4228352 (1980-10-01), Adrian
patent: 5341214 (1994-08-01), Wong
patent: 5384640 (1995-01-01), Wong

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